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Optronics LED Clearance or Side Marker Light w/ Reflex Reflector - 6 Diodes - Oval - Amber Lens

Optronics LED Clearance or Side Marker Light w/ Reflex Reflector - 6 Diodes - Oval - Amber Lens

Item # MCL31AB
Our Price: $6.03
Trailer Lights
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Shipping Weight: 0.12 lbs
In Stock
Optronics 4L x 2W Inch Trailer Lights - MCL31AB
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4" x 2-1/6" Oval. LED trailer light functions as a clearance or side marker light when properly mounted. Built-in reflex reflector. Durable ABS housing. Surface mount - hardware not included. 2-Wire design. P2 rated. Great Prices for the best trailer lights from Optronics. Optronics LED Clearance or Side Marker Light w/ Reflex Reflector - 6 Diodes - Oval - Amber Lens part number MCL31AB can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (173)
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Optronics Trailer Lights - MCL31AB

  • Clearance Lights
  • Oval
  • LED Light
  • Amber
  • 4L x 2W Inch
  • Surface Mount
  • Rear Clearance
  • Side Marker
  • Non-Submersible Lights
  • Optronics

4" x 2-1/6" Oval. LED trailer light functions as a clearance or side marker light when properly mounted. Built-in reflex reflector. Durable ABS housing. Surface mount - hardware not included. 2-Wire design. P2 rated.


  • LED trailer light functions as a clearance light or side marker light when properly mounted
  • Built-in reflex reflector removes the need for a separate reflector
  • LEDs make great replacements for incandescent lights
    • Last 50 times longer
    • More efficient - provide brighter light with less power output
    • No bulbs to replace - no brittle filaments
  • Durable ABS housing and acrylic lens
  • Amber lens over white LEDs
  • Compatible with 12V DC systems
  • Surface mount to trailer - hardware not included
  • 2-Wire design includes power lead and ground wire
  • DOT compliant
  • P2 rated


  • Dimensions: 4" long x 2-1/16" tall x 1" deep
  • Distance between mounting holes (center to center): 3"
  • Diodes: 6
  • Power draw at 12.8V: 0.040 amps
  • Lifetime warranty on LEDs

Optronics MCL31 Series Amber LED Side Marker and Clearance Light with Reflex Diagram

P2-Rated Lights

Diagram of light spread for P2 rated light

A P2-rated light produces a 45-degree angle of light to either side of its centerline for a total of 90 degrees of coverage. This beam pattern can be seen straight on, but it cannot be seen clearly from the side. So this type of light can be used as either a side marker light or a clearance light, but it cannot function as both. If you need both functions, then you must install 2 separate lights on your trailer - one as a front or rear clearance light and one as a side marker light.

MCL31AB Optronics LED Clearance or Side Marker Trailer Light w/ Reflex Reflector - 6 Diodes - Oval - Amber Lens - P2 Rated

Alternate part number: MCL-31AB

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Optronics LED Clearance or Side Marker Light w/ Reflex Reflector - 6 Diodes - Oval - Amber Lens - MCL31AB

Average Customer Rating:  4.8 out of 5 stars   (173 Customer Reviews)

4" x 2-1/6" Oval. LED trailer light functions as a clearance or side marker light when properly mounted. Built-in reflex reflector. Durable ABS housing. Surface mount - hardware not included. 2-Wire design. P2 rated.


I removed a light of the same shape that had an incandescent bulb. This light did not require any electrical changes such as the addition of a resistor. It did require one new hole per fixture due to the holes not lining up with the holes from the old light. Also, the size of the screws/bolts that held it in place had to be smaller. I used 10-32 screws and lock nuts to secure it. This was NOT a direct replacement as I thought it would be. The 2 wires about about 2 gauges smaller than the original light. It works fine once installed. It caused added expense and more labor. Looks pretty much identical to what I took off but it is brighter and builds no heat when on. For the money, it was a good purchase.


Easy to install on my trailer. LED is the way to go!


Easy to install. Great replacement option for my old lights on my camper. I was surprised that the LED bulbs are amber along with the lens.


I used this side marker to replace existing Bargman 99 series lights on a camping trailer. The Optronics LED model was not quite as bright as I would expect for a 6 diode unit, but still an improvement over the incandescent model. It is larger in size than the Bargman 99 series, so it covers up any surface imperfections on the trailer.


Good buy for a great side marker. Lamp comes with about a five or six inch lead wires that simplify electrical installation.

LED lights are bright and working well after a year of regular use.
Paul - 12/10/2021


Everything came exactly as described with very fast shipment!


they look good, I'm sure they will work flawlessly when I install them on my boat trailer


Easy install on my horse trailer. Nice and bright, just as expected.


Worked as a replacement for Peterson Top hat lights Replaced 31 in total


One of the best upgrades I made was switching the lights to LED.


Extremely fast shipping


etrailer is a great company to purchase from a good variety of products and fair prices.


I needed to replace some of the lights on my boat trailer. The old light were incandescent and some of the bulbs had burned out, securing screws were rusted. Product was exactly what I was looking for. Links on each product web page provided very good description and product information.

Thank you for great selection and process.

I am very happy, the lights are working great, with no issues. Thank you
Phil Z - 11/21/2017


The lights work great, very bright. Easy to connect the wires and mounting was a breeze.

These lights are easy to install and are bright.
Cheryl T - 07/24/2021


Outstanding service and products always on time keep up the great work


have not installed yet but perfect for my car trailer.


I was having problems with the electrical system on my horse trailer. Basically the marker and tail lights were all original (18 years old) and worn out. I believe they were causing shorts as well as drawing way too much current. We changed all the trailer lights to LED and the transformation is remarkable - no more braking problems, no more dim barely working runnig lights. The service from etrailer was excellent. Everything arrived as ordered and promised.


Perfect OEM fit. Installation and connecting was simple. I've got a travel trailer and boat trailer, and use eaTrailer for anything I need for both.


replaced trailer wireing with thicker wire, replaced 4 side marker lights led, replaced both tail lights led, all worked and look good. I just hope these led lights last a long time. the lights I took off all worked, but were not as bright as I wanted, they were the original lights that were on my pontoon boat trailer.


LED lights are the way to go. The reflective marker lights are great for times when the lights aren't on yet headlights will reflect off them letting the driver know there is something there. The only thing would be better on these lights would be a better ground.


A good light that is perfect on my motorcycle camping trailer, gives off ample light for others to see because a motorcycle can sometimes be more difficult to notice than a larger vehicle. These are replacing old original incandescent lights, thay are brighter and use less electricity making it easier on the motorcycles electrical system. The product is as described on etrailer and arrived on time and in good condition.


I was very fortunate to have purchased an all fiberglass enclosed motorcycle trailer from a friend who no longer rides. Over the years I have updated to all LED lighting and replaced all hardware to marine grade stainless. I live in the tropics with high humidity and plenty of salt erosion, therefore, this is further protection against corrosion. LED lights purchased from your company we’re not only reasonably priced but excellent quality...


Product is of good quality and was easy to install


Excellent set of lights for my horse trailer. Installation was easy and the brightness of the LED lights is outstanding. No more replacing bulbs or cleaning contacts for the bulbs to work properly. Etrailer shipping was fast and all products were excellent.


etrailer had everything I was looking for. Their easy search lists are great for looking for specific items. I found trim for my pop up camper door that I have been searching for every where. All ordered items were exactly what I need. Service was very helpful in finding the correct items. Delivery was fast.

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